DE1614819A1 - Optical gas laser with internal reflectors - Google Patents

Description

Patent attorney _Q MpL Ph ^ Dr. Walther iJunius 1614813

fHmbovt, tim _{Λ T. crt}

June 1, 1967

Dr.J / Ha.

My file: 1316

TESIA, n & rodnl podnik, Praha. HloubStln, PodSbradska

Optical gas laser with internal reflectors.

The gas lasers such as helium, neon and argon lasers and the like amplifiers exist in most cases a discharge tube in which the grass medium is excited and an optical resonator. The discharge tube is usually provided with crooked, so-called Brewster windows at its end, which allow the Reduce reflection losses to a minimum. The optical resonator is either through two mirrors or through highly reflective optical systems (such as a prism) and formed by a mechanical support system, which their ensures a constant position and at the same time enables the mutual adjustment of the mirror position and the discharge tube.

In order to reduce the losses of the optical resonator to a minimum, © is sometimes used in lasers with internal mirrors. this ± $ t the optical resonator through © in the exterior

meöhiiuaisQh © translation ing lfakuum ₉ you

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precise adjustment of the mirror is necessary, is achieved with the help of corrugated bellows. The discharge tube is formed by a tube of glass or fused quartz.

In another Laeerkonstruktion, which is shown in Fig. 1, the support system of the resonator is through a thick-walled insulation tube 1 formed, which at their The ends have precisely ground flanges 4 and 5. The mirror 2.3 are vacuum-tight attached to the flanges 4.5 and their Adjustment is given by the mutual orientation of the flanges.

This system is very compact, but technologically very demanding from the standpoint of vacuum processing. Besides that it is not possible to In the course of operation the mirror to change its mind with the aim of modifying the structure of the original bundle of the laser to change. For thermal reasons it is necessary to use all insulating material fused quartz or other thermally resistant material to be used, which at Vacuum connections cause difficulties and are difficult to work with ».

The invention avoids this problematic area. The invention creates a simple and at the same time very compact design for a laser in which the discharge tube is thermally separated from the optical systems and from the evacuated Get & B, however. is arranged by this. "

■ · '-BAD ORIGINAL

The optical gas laser or amplifier with internal mirrors according to this invention is formed by an evacuated cylinder, which simultaneously serves as a support device of the optical resonator, while the excitation of the active medium runs inside a discharge tube, which is located inside the evacuated cylinder «The diameter of the The discharge tube is chosen with regard to the grass filling used and the generated wavelength. The space between the evacuated cylinder and the discharge tube * is divided by means of a partition which ensures that the electrical discharge passes in the inner part of the discharge tube. Either internal or external electrodes are used, depending on the type and manner of excitation by direct current or high-frequency current discharge.

The invention is based on an embodiment of the gas laser of this invention disclosed in Pig. 2 is shown, explained in more detail. The laser is formed by an evacuated vessel 6 (here of cylindrical shape) made of glass or other insulating material and an inner discharge tube 7, which surrounds the space in which it is used for excitation as a result of the collisions of the electrons with atoms or molecules of the active gas the corresponding energy states comes. The tube 7 is connected to the casing 6 by means of a partition, which prevents the electrical discharge from occurring outside the inner part of the tube 7 and which forms the same function of the tube. Here you see idewand becomes g. B.

formed by the neck θ of the elongated part 6 of the discharge tube or at least by a ring 9. The evacuated vessel 6 'is connected at the opposite ends to the systems 10 and 11 in which the mirrors 12, 13 or other reflectors of the optical resonator are held. The output beam of the laser passes through the semitransparent mirrors, or at least one of them, and comes out through the output windows 14 and 15. The mechanisms 16 and 17 are used to adjust the position of the mirrors. In the exemplary embodiment, the excitation is brought about by means of a direct current discharge between the electrodes 18 and 19. By using the systems 10 and 11 of the construction, the adjustment of the mirrors can be carried out either before the vacuum-tight sealing of the vacuum vessel 6 or afterwards, for operation also during operation, in which case an externally carried out type of adjustment is used. The wavelength of the generated laser frequency is given by the gas filling used and the selective properties of the mirrors. The configuration and moda structure of the bundle depends on the geometric arrangement and its setting.

The laser with the internal mirrors according to the invention has a compact design. Compared with similar previously known l ^ laser pen with adjustable mirrors it is lighter, is also easily transferable and can be used operationally climatic Betiagungen as ".B. in elnar Omgesung old large

009852/1761

environment, even in non-aggressive liquids. The relative Large Vacuum Tube 6 Contents of Laser Provides One Graereeervoir and ensures a longer service life of the Lasers. The course of the discharge path creates through the geometric arrangement between the electrodes conditions to suppress unstabilities of the discharge and thereby also of instabilities in the output power of the laser, which in the previous arrangements by the occurrence caused by moving layers and by the tendency to relax.

The gas laser according to this invention serves as a source of monochromatic, coherently highly directed light radiation and is for optical, mechanical, geodetic and other physical Measurements (such as interferences) determine where small dimensions of the measuring device, climatic resistance, cheap "possibility of transmission and the like Properties are desirable that the laser can use as either Allow basic or auxiliary equipment to be usable.

Claims (1)

Claim 1. Optical gas laser with internal reflectors that pass through an evacuated cylinder is formed, at aessen opposite Ends systems are attached, which are the reflectors of the optical resonator and the exit window contain, characterized, that inside the evacuated cylinder (6) a discharge-receiving tube (7) is attached, which at least at one point on its outer circumference has a partition (8,9) which defines the space between the discharge tube (7) and the evacuated cylinder (6) to prevent discharge in this space. 2 «Optical gas laser according to claim 1,
characterized, that the septum elongated through the neck (8) of the Part of the discharge tube (7) is formed. 3 · Optical gas laser according to claim. 1, . characterized, that the septum is formed at least by a ring (9) , bit to which the discharge tube (7) is attached to the evacuated cylinder (6) . -tr -ü 003852/1761